pinctrl: zynq: fix typo in sdio1_3_grp pin list

It contains pin 50 instead of pin 40.

Signed-off-by: Daniel Glöckner <dg@emlix.com>
Reviewed-by: Sören Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>